Imac (Intel) 2.66mz 24inch Can I increase RAM?

Hi
I have an Imac(Intel) from 2009/2010 and am, I believe, almost at the current RAM limit. I was looking to increase the RAM having been told by the Apple store (when I purchased the machine) how easy it was. I checked the Apple Store site to buy RAM but it says 'not available for this family'. How do I increase RAM?
Thank you.
Running OS X Mavericks

I do not recommend you to buy RAM from the Apple Online Store. It is too expensive and it is the same RAM you can buy from other sources.
First of all you need the exact iMac model you have. To check this, open  > About this Mac > More Info, and you will see your iMac model below "iMac".
Then, buy the RAM for your iMac model. I recommend you to buy it at OWC or Crucial

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Can I increase RAM on an iMac 2.5 GHz Intel Core i5?

My computer has been running very slow so I went into the activity monitor and observed that I have 4GB of physical memory and I am using 3.60-3.98 GB during regular operation. Can I add RAM to this machine or is there another way to lower the GB of memory used so the machine runs faster.
My hard drive is 500GB and I have 210GB free, so I don't think it is a hard drive problem.
Any support is much appreciated.
Machine is 21.5 inch iMac, mid 2011.
Processor is 2.5GHz Intel core i5
4 GB 1333 MHz DDR3
AMD Radeon HD 6750M 512 MB

EtreCheck version: 2.1.2 (105)
Report generated December 14, 2014 at 4:15:17 PM PST
Hardware Information: ℹ️
iMac (21.5-inch, Mid 2011) (Verified)
iMac - model: iMac12,1
1 2.5 GHz Intel Core i5 CPU: 4-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
BANK 0/DIMM1
empty empty empty empty
BANK 1/DIMM1
empty empty empty empty
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
AMD Radeon HD 6750M - VRAM: 512 MB
iMac 1920 x 1080
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 6:50:14
Disk Information: ℹ️
WDC WD5000AAKS-402AA0 disk0 : (500.11 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 499.25 GB (209.89 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-STDVDRW GA32N
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Internal Memory Card Reader
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Configuration files: ℹ️
/etc/launchd.conf - Exists
Gatekeeper: ℹ️
Mac App Store and identified developers
Adware: ℹ️
Geneio [Remove]
Kernel Extensions: ℹ️
/System/Library/Extensions
[not loaded] com.Belcarra.iokit.USBLAN_netpart (2.0.2) [Support]
[not loaded] com.Belcarra.iokit.USBLAN_usbpart (2.0.2) [Support]
[not loaded] com.RemoteControl.USBLAN.usbpart (2.0.6) [Support]
[not loaded] com.aliph.driver.jstub (1.1.2 - SDK 10.7) [Support]
[not loaded] com.kodak.print.printerdock.merge (1.0.0) [Support]
[not loaded] com.sony.driver.prs (1.0.1d1) [Support]
/System/Library/Extensions/Belcarra.USBLAN_netpart.kext/Contents/PlugIns
[not loaded] com.belcarra.iokit.netpart.panther (1.6.1) [Support]
/System/Library/Extensions/Belcarra.USBLAN_usbpart.kext/Contents/PlugIns
[not loaded] com.belcarra.iokit.usbpart.panther (1.6.1) [Support]
/System/Library/Extensions/RemoteControl.USBLAN_usbpart.kext/Contents/PlugIns
[not loaded] com.RemoteControl.USBLAN.panther (1.6.1) [Support]
Startup Items: ℹ️
IntegoCommon: Path: /Library/StartupItems/IntegoCommon
Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Support]
[loaded] com.oracle.java.Java-Updater.plist [Support]
[running] com.rosettastone.rosettastonedaemon.plist [Support]
[not loaded] com.sony.ReaderLibrary.RunReaderLibrary.plist [Support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
[invalid?] com.app4mac.CheckUpAgent.plist [Support]
[loaded] com.google.keystone.daemon.plist [Support]
[running] com.intego.personalantispam.daemon.plist [Support]
[running] com.intego.task.manager.daemon.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
[loaded] com.oracle.java.Helper-Tool.plist [Support]
[loaded] com.oracle.java.JavaUpdateHelper.plist [Support]
[loaded] com.sonos.smbbump.plist [Support]
[running] com.synium.cleanappdaemon.plist [Support]
User Launch Agents: ℹ️
[running] com.mlbam.nexdef.core.NexdefLoader.plist [Support]
[loaded] com.spotify.webhelper.plist [Support]
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
apple-scc-20131201-092552 UNKNOWN (missing value)
Spotify UNKNOWN (missing value)
Jawbone Updater Application (/Applications/Jawbone Updater.app)
EvernoteHelper Application (/Applications/Evernote.app/Contents/Library/LoginItems/EvernoteHelper.app)
Huddle Application (/Applications/Huddle.app)
Internet Plug-ins: ℹ️
o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]
nplastpass: Version: 3.1.21 [Support]
Unity Web Player: Version: UnityPlayer version 2.6.1f3 [Support]
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 2.2.0.49 [Support]
RealPlayer Plugin: Version: Unknown [Support]
Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Support]
FlashPlayer-10.6: Version: 16.0.0.240 - SDK 10.6 [Support]
Flash Player: Version: 16.0.0.240 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
QuickTime Plugin: Version: 7.7.3
googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]
iPhotoPhotocast: Version: 7.0
Photo Center Plugin: Version: Photo Center Plugin 1.1.2.2 [Support]
SharePointBrowserPlugin: Version: 14.4.4 - SDK 10.6 [Support]
GarminGPSControl: Version: 3.0.1.0 Release - SDK 10.4 [Support]
JavaAppletPlugin: Version: Java 7 Update 71 Check version
User internet Plug-ins: ℹ️
CitrixOnlineWebDeploymentPlugin: Version: 1.0.92 [Support]
WebEx64: Version: 1.0 - SDK 10.6 [Support]
WebEx: Version: 1.0 [Support]
Safari Extensions: ℹ️
Evernote Web Clipper
LastPass
3rd Party Preference Panes: ℹ️
Flash Player [Support]
Flip4Mac WMV [Support]
Growl [Support]
Java [Support]
NetUpdate [Support]
Time Machine: ℹ️
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 499.25 GB Disk used: 289.36 GB
Destinations:
Data [Network]
Total size: 3.00 TB
Total number of backups: 91
Oldest backup: 2013-07-20 00:44:13 +0000
Last backup: 2014-12-14 23:52:50 +0000
Size of backup disk: Excellent
Backup size 3.00 TB > (Disk size 499.25 GB X 3)
Top Processes by CPU: ℹ️
      2% WindowServer
      1% Huddle
      0% mds_stores
      0% loginwindow
      0% fontd
Top Processes by Memory: ℹ️
198 MB Safari
172 MB mds_stores
163 MB Evernote
94 MB Finder
90 MB Mail
Virtual Memory Information: ℹ️
50 MB Free RAM
1.72 GB Active RAM
1.67 GB Inactive RAM
849 MB Wired RAM
4.02 GB Page-ins
6 MB Page-outs
Diagnostics Information: ℹ️
Dec 14, 2014, 04:12:13 PM CleanApp Daemon_2014-12-14-161213_[redacted].crash
Dec 14, 2014, 09:25:46 AM Self test - passed
Dec 14, 2014, 08:47:55 AM CleanApp Daemon_2014-12-14-084755_[redacted].crash
Dec 14, 2014, 07:22:42 AM CleanApp Daemon_2014-12-14-072242_[redacted].crash
Dec 13, 2014, 11:07:25 AM CleanApp Daemon_2014-12-13-110725_[redacted].crash
Dec 13, 2014, 10:57:59 AM CleanApp Daemon_2014-12-13-105759_[redacted].crash
Dec 13, 2014, 10:33:44 AM CleanApp Daemon_2014-12-13-103344_[redacted].crash
Dec 13, 2014, 03:07:07 AM CleanApp Daemon_2014-12-13-030707_[redacted].crash
Dec 12, 2014, 11:42:48 AM CleanApp Daemon_2014-12-12-114248_[redacted].crash
Dec 12, 2014, 07:28:17 AM CleanApp Daemon_2014-12-12-072817_[redacted].crash
Dec 11, 2014, 07:34:56 PM CleanApp Daemon_2014-12-11-193456_[redacted].crash

Boot up iMac Intel. Kernal Panic can't boot up computer??

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Message was edited by: myhighway

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That is more likely to be the problem, not lack of RAM. When free space on the hard drive gets low, the remaining space gets more and more fragmented into tiny pieces, as you write new data and delete old data. When there is plenty of free space, you have a large blocks of contiguous free space. Mac OS X needs free space on the startup volume for its basic operations. It write and reads hidden files to do things like virtual memory (used when you are low on real RAM). Some of those files can get very large, and if the remaining free space is in tiny pieces scatter all over our drive, the system may start to bog down.
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Hello JNotorious,
Thank you for using Apple Support Communities.
For more information, take a look at:
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http://support.apple.com/kb/ht1151
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Imac (Intel) 2.66mz 24inch Can I increase RAM?

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